Telrad designed the Pulser Unit so users can upgrade their reflex sight to make the sight's illuminated reticle pulsate. Installation of the Pulser Unit requires removal of the old battery holder and replacing it with one provided, as well as cutting and stripping battery terminal wires, so this is a permanent modification to the sight. When installed, users will retain control of the reticle intensity with the added function of being able to make the reticle pulsate at variable rates.